CN102643632A - High-temperature salt-resistant fluid loss agent and production method thereof - Google Patents

Abstract

The invention relates to a high-temperature salt-resistant fluid loss agent CG910L and a production method thereof, belonging to the field of casing and cementing. The high-temperature salt-resistant fluid loss agent CG910L meets the requirement of casing and cementing work when a well is drilled in case of seep well and complex stratum and aims at improving the construction performance of cement slurry, reducing the filter loss of the cement slurry and reducing the shrinkage mass of cement stone. The high-temperature salt-resistant fluid loss agent CG910L comprises the following components: 2-acrylamido 2-methyl propanesulfonic acid, acrylamide, methacrylic acid, acrylonitrile, an activating agent, an initiator, an emulsifying agent, a terminating agent and deionized water. The high-temperature salt-resistant fluid loss agent CG910L has the following advantages that 1, the construction performance of the cement can be improved; 2, the filter loss of the cement slurry can be reduced; 3, the shrinkage mass of the cement stone can be reduced, and the gluing characteristic among a cement ring, a sleeve and the stratum can be improved; 4, the elasticity and the impact resistance of the cement stone can be improved, the production service life of an oil-gas well can be prolonged, and the fragmentation degree of the cement ring caused by perforation can be reduced; and 5, the use temperature range is: 150-180.

Description

Anti-salt water retaining of a kind of high temperature and working method

Technical field

The present invention relates to a kind of high temperature anti-salt water retaining CG910L and producer casing and cementing owned by France field, satisfy the well cementing operation demand under deep-well and the bad ground drilling condition.

Background technology

For the temperature high-pressure salt-resistant high system; The research and development of China are more backward, and its technical application level still rests in the theoretical category and the test exploratory stage, and particularly existing cement additive product steady quality performance is poor; Formed cement slurry property is poor; The heat and salinity tolerance ability is low, and is serious to hydrocarbon contamination, and cementing quality does not reach construction requirement.In most cases have to introduce external product at present for the assurance cementing quality; Directly increased drilling cost; And depend merely on import or introduce relevant admixture; Far can not satisfy the demand of oil field deep well well cementation, it is extremely necessary therefore researching and developing the anti-salt cement admixture of new high temperature (be mainly retardant, water retaining and hardening accelerator, other existing admixture and extra material performance can meet the demands).

Summary of the invention

A kind of high temperature anti-salt water retaining CG910L and working method that the present invention proposes.Its objective is the anti-salt cement water retaining of high temperature that exploitation is new, improve the workability of grout, reduce the filter loss of grout, reduce the shrinkage of cement stone.

The anti-salt water retaining of a kind of high temperature CG910L, its component and weight percent are

2-acrylamido 2-methyl propane sulfonic acid 8.3%;

Acrylic amide 2.6%;

Methylacrylic acid 1.8%;

Vinyl cyanide 7.3%;

Acvator 0.12%;

Initiator 0.17%;

Emulsifying agent 0.18%;

Terminator 0.018%;

Deionized water deducts the surplus of said components amount gained.

The above-mentioned anti-salt water retaining of a kind of high temperature CG910L, described acvator is a ferrous sulfate.

The above-mentioned anti-salt water retaining of a kind of high temperature CG910L, described initiator is an ammonium persulphate.

The above-mentioned anti-salt water retaining of a kind of high temperature CG910L, described emulsifying agent is a sodium lauryl sulphate.

The above-mentioned anti-salt water retaining of a kind of high temperature CG910L, described terminator is a Resorcinol.

The working method of the anti-salt water retaining of high temperature CG910L is:

With 2-acrylamido 2-methyl propane sulfonic acid, acrylic amide, methylacrylic acid, vinyl cyanide is starting monomer; Add emulsifying agent, initiator, acvator, terminator; Carry out the radical copolyreaction at low temperatures; When reaction reaches the intended conversion rate, add terminator, stop polymerization and promptly get the agent of the anti-salt water retaining of high temperature.

The concrete production stage of the anti-salt water retaining of high temperature CG910L is following:

First step, 2-acrylamido 2-methyl propane sulfonic acid, acrylic amide, methylacrylic acid, vinyl cyanide are added in the reaction kettle, add deionized water and emulsifying agent, acvator, initiator; Begin simultaneously to stir, because of reaction is thermopositive reaction, treat no longer to heat up when temperature rises to 45 ℃, need to feed steam heating, temperature of reaction is controlled between 64-66 ℃;

Second step, kept temperature of reaction 10 hours, sampling detects, if when the multipolymer transformation efficiency does not reach requirement, should keep temperature to proceed reaction;

Third step, when the transformation efficiency of multipolymer that polymer monomer forms reaches 97 ℅ when above, add terminator, stop polyreaction and promptly get the anti-salt water retaining of qualified high temperature CG910L.

Research and practice show that behind the anti-salt water retaining of an amount of high temperature of admixture, its grout is compared with conventional grout, has the characteristic of following excellence: the workability that 1, can improve grout in general grout; 2, can reduce the filter loss of grout; 3, can reduce the shrinkage of cement stone, improve the glued characteristic on cement mantle and sleeve pipe and stratum; 4, can improve the elasticity and the shock resistance of cement stone, prolong the production life-span of oil gas well, reduce the cracked degree that perforation causes cement mantle; 5, use temperature scope: 150～180 ℃.

Embodiment

Lift the two groups of anti-salt agent for anti gassing-out of high temperature PCR770L prescriptions at present and be example explanation the present invention program,

Prescription 1:

Material name	Dosage (kg)
		2-acrylamido 2-methyl propane sulfonic acid	250
Acrylic amide	80
		Methylacrylic acid	55
Vinyl cyanide	220
		Ferrous sulfate (acvator)	3.5
Ammonium persulphate (initiator)	5.0
		Sodium lauryl sulphate (emulsifying agent)	5.5
Resorcinol (terminator)	0.55
		Deionized water	2400

Can make the anti-salt water retaining of high temperature CG910:2980kg.

Prescription 2:

Material name	Dosage (kg)
		2-acrylamido 2-methyl propane sulfonic acid	246
Acrylic amide	79
		Methylacrylic acid	53
Vinyl cyanide	216
		Ferrous sulfate (acvator)	3.4
Ammonium persulphate (initiator)	4.9
		Sodium lauryl sulphate (emulsifying agent)	5.2
Resorcinol (terminator)	0.55
		Deionized water	2380

Can make the anti-salt water retaining of high temperature CG910:2950kg

The production stage of two assembly sides is identical, presses following step production:

First step, 2-acrylamido 2-methyl propane sulfonic acid, acrylic amide, methylacrylic acid, vinyl cyanide are added in the reaction kettle, add deionized water and emulsifier sodium lauryl sulfate, acvator ferrous sulfate, initiator ammonium persulfate; Begin simultaneously to stir, because of reaction is thermopositive reaction, treat no longer to heat up when temperature rises to 45 ℃, need to feed steam heating, temperature of reaction is controlled between 64-66 ℃;

Second step, kept temperature of reaction 10 hours, sampling detects, if when the multipolymer transformation efficiency does not reach requirement, should keep temperature to proceed reaction;

The 3rd step, reach 97 ℅ when above when the transformation efficiency of multipolymer that polymer monomer forms, adding terminator Resorcinol, the termination polyreaction promptly gets the anti-salt water retaining of qualified high temperature CG910L.

CG910L compares with homemade CG71L water retaining, has advantages such as little, the anti-salt of dosage, not thixotroping.

The performance of CG910L and CG71L compares:

Performance	CG910L	CG71L
			Dosage	3-4	4-6
Saline-alkaline tolerance	Anti-salt, available 24% salt solution is joined slurry	Not anti-salt, the concentration of the cl of pulp-water is joined in strict control
			Stability	Stable, need not add stablizer again	Instability needs to confirm the stablizer dosage through experiment
The foaming situation	Few	Many

The performance of typical C G910L24% brine cement slurry:

Explain: all with good China " G " class g cement, add the skimmer CX62L of 0.3% (BWOC) in the above-mentioned brine cement slurry.

The performance of typical C G910L fresh water grout (every cubic centimetre of sg=1.9 gram):

The performance of typical C G910L fresh water grout (every cubic centimetre of sg=1.58 gram):

The CSP305S spacer pad is to the influence of CG910L grout:

Can know that from experimental result the saline-alkaline tolerance of CG910L grout is very strong, and (saline-alkaline tolerance of CG910L grout can resist 24% salt solution, the then not anti-salt of CG71L water retaining.

Market forecast and promotion prospect:

The anti-salt water retaining of high temperature CG910L succeeds in developing, and is applicable to the well cementing operation of the high temperature superpressure deep-well in warbler fine jade basin, the South Sea, has both helped improving cementing quality, can substitute the import well cementing material again, reduces the well cementation cost greatly.Be applicable to simultaneously in the well cementing operation of other flds, solve the problem of the high salt deposit of interlayer, have very big social benefit and marketing prospect.

Claims (6)

1. the anti-salt water retaining of high temperature CG910L, its component and weight percent are

2-acrylamido 2-methyl propane sulfonic acid 8.3%;

Acrylic amide 2.6%;

Methylacrylic acid 1.8%;

Vinyl cyanide 7.3%;

Acvator 0.12%;

Initiator 0.17%;

Emulsifying agent 0.18%;

Terminator 0.018%;

Deionized water deducts the surplus of said components amount gained.

2. the anti-salt water retaining of a kind of high temperature according to claim 1 CG910L is characterized in that described acvator is a ferrous sulfate.

3. the anti-salt water retaining of a kind of high temperature according to claim 1 CG910L is characterized in that the anti-salt water retaining of described a kind of high temperature CG910L, and described initiator is an ammonium persulphate.

4. the anti-salt water retaining of a kind of high temperature according to claim 1 CG910L is characterized in that described emulsifying agent is a sodium lauryl sulphate.

5. the anti-salt water retaining of a kind of high temperature according to claim 1 CG910L is characterized in that described terminator is a Resorcinol.

6. the working method of the anti-salt water retaining of a high temperature CG910L is:

First step, 2-acrylamido 2-methyl propane sulfonic acid, acrylic amide, methylacrylic acid, vinyl cyanide are added in the reaction kettle, add deionized water and emulsifying agent, acvator, initiator; Begin simultaneously to stir, because of reaction is thermopositive reaction, treat no longer to heat up when temperature rises to 45 ℃, need to feed steam heating, temperature of reaction is controlled between 64-66 ℃;

Second step, kept temperature of reaction 10 hours, sampling detects, if when the multipolymer transformation efficiency does not reach requirement, should keep temperature to proceed reaction;

Third step, when the transformation efficiency of multipolymer that polymer monomer forms reaches 97 ℅ when above, add terminator, stop polyreaction and promptly get the anti-salt water retaining of qualified high temperature CG910L.